• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Meteorology and Climatology >Turbulent Flux Transfer over Bare-Soil Surfaces; Characteristics and Parameterization
【24h】

Turbulent Flux Transfer over Bare-Soil Surfaces; Characteristics and Parameterization

机译：裸土表面的湍流通量传递;特性和参数化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Parameterization of turbulent flux from bare-soil and undercanopy surfaces is imperative for modeling land-atmosphere interactions in arid and semiarid regions, where flux from the ground is dominant or comparable to canopy-sourced flux. This paper presents the major characteristics of turbulent flux transfers over seven bare-soil surfaces. These sites are located in arid, semiarid, and semihumid regions in Asia and represent a variety of conditions for aerodynamic roughness length (z_(om); from <1 to 10 mm) and sensible heat flux (from-50 to 400 W m~(-2)). For each site, parameter kB~(-1) [=ln(z_(om)/z_(om)), where z_(oh) is the thermal roughness length] exhibits clear diurnal variations with higher values during the day and lower values at night.Mean values of z_(oh) for the individual sites do not change significantly with z_(om) resulting in kB~(-1) increasing with z_(om) and thus the momentum transfer coefficient increases faster than the heat transfer coefficient with z_(om) The term kB~(-1)often becomes negative at night for relatively smooth surfaces (z_(om) ~ 1 mm), indicating that the widely accepted excess resistance for heat transfer can be negative, which cannot be explained by current theories for aerodynamically rough surfaces. Last, several kB~(-1) schemes are evaluated using the same datasets. The results indicate that a scheme that can reproduce the diurnal variation of kB~(-1) generally performs better than schemes that cannot.
机译：裸露土壤和冠层下表面的湍流通量的参数化对于模拟干旱和半干旱地区的土地-大气相互作用是必不可少的，在这些地区，来自地面的通量占主导地位或与冠层源通量相当。本文介绍了在七个裸土表面上湍流通量的主要特征。这些地点位于亚洲的干旱，半干旱和半湿润地区，代表了空气动力学粗糙度长度（z_（om）; <1至10 mm）和显热通量（-50至400 W m〜的各种条件）。 （-2））。对于每个站点，参数kB〜（-1）[= ln（z_（om）/ z_（om）），其中z_（oh）是热粗糙度长度]表现出明显的昼夜变化，白天的数值较高，而数值较低各个位置的平均值z_（oh）随z_（om）的变化不明显，导致kB〜（-1）随着z_（om）的增加而增加，因此动量传递系数的增加速度快于传热系数对于z_（om），相对较光滑的表面（z_（om）〜1 mm），术语kB〜（-1）经常在夜间变为负值，这表明广泛接受的传热过量电阻可能为负，这无法解释。根据当前理论对空气动力学粗糙的表面。最后，使用相同的数据集评估了几种kB〜（-1）方案。结果表明，能够再现kB〜（-1）日变化的方案通常比不能做到的方案表现更好。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号